Answer:
the user cannot use a computer system without hardware and software
The answer is A. Bacteria leave a thanks if i am correct please.
Answer: C
Time shifting is when you move from one period in time to another.
Three characteristics of an ideal encrytion scheme are:
1. The encryption sheme should be strong: the algorithm is imprevious to direct attack and attempts are derived.
2. The encryption scheme should create unique ciphertext from the same plaintext for each key permutation, among other traits.
3. It should take at least millions of years to break ideal encryption scheme, based on mathematical predictions.
